ISL70001ASEHEV1Z
Evaluation Board
APPLICATION NOTE
AN1842 Rev.1.00
Page 1 of 9
Jun 11, 2013
AN1842
Rev.1.00
Jun 11, 2013
The ISL70001ASEHEV1Z evaluation board is designed to
demonstrate the features of the
, a TID and SEE
hardened 6A synchronous buck regulator IC with integrated
MOSFETs intended for Space applications. For more detailed
information about the ISL70001ASEH, please refer to the
datasheet.
The ISL70001ASEHEV1Z evaluation board accepts a nominal 3V
to 5.5V input voltage and provides a regulated output voltage
ranging from 0.8V to 85% of the input voltage at output currents
ranging from 0A to 6A. The output can be quickly set to any of six
commonly used preset voltages (0.8V, 1.0V, 1.2V, 1.8V, 2.5V,
3.3V) or adjusted to an alternate voltage using the onboard
potentiometer. A PGOOD (Power-Good) signal goes high and
lights a red LED to indicate that the output voltage is within a
±11% typical regulation window. A toggle switch is provided to
conveniently enable or disable the output voltage.
The ISL70001ASEHEV1Z evaluation board can be set to run from
the nominal 1MHz internal oscillator of the ISL70001ASEH or
synchronized to a 1MHz ±20% external clock. Two or more
ISL70001ASEHEV1Z evaluation boards can be synchronized to
each other in a Master/Slave configuration, with all Slave units
switching 180° out-of-phase with respect to the Master unit.
Schematic and BOM
A schematic and BOM of the ISL70001ASEHEV1Z evaluation
board are shown in Figure 1 and Table 1, respectively. The
schematic indicates numerous test points, which allow virtually
all nodes of the evaluation circuit to be monitored directly. The
BOM shows components that are representative of the types
needed for a design, but these components are not
space-qualified. Equivalent space-qualified components would
be required for flight applications.
Recommended Test Equipment
• A 0V to 6V power supply with at least 10A source current
capability.
• An electronic load capable of sinking current up to 6A.
• Two digital multimeters (DMMs).
• A 500MHz dual-trace oscilloscope.
Quick Start
1. Short J1, J2 (pins 2-3), J4 (pins 1-2), J5 and J15.
2. Open J3, J7 and J9-J13.
3. Toggle S2 to the down (OFF) position.
4. Turn on the power supply. Set the output voltage to 3.3V and
set the output current limit to 10A. Turn off the power supply.
5. Connect the positive lead of the power supply to TP1 and the
negative lead of the power supply to TP2.
6. Turn on the electronic load and set the output current to 3A.
7. Connect the positive lead of the electronic load to TP44 and
connect the negative lead of the electronic load to TP45.
8. Configure one DMM to monitor the input voltage from TP22 to
TP25.
9. Configure another DMM to monitor the output voltage from
TP38 to TP39.
10. Connect Channel 1 of the oscilloscope to J6 (or from TP33 to
TP28) to monitor the rectangular waveform on the LXx pins.
11. Connect Channel 2 of the oscilloscope to J14 (or from TP36 to
TP37) to monitor the output voltage.
12. Toggle S2 to the up (ON) position.
13. Verify the output voltage is 0.8V ±3% and the frequency of the
LXx waveform is 1MHz ±10%.
Configuration Options
The ISL70001ASEHEV1Z evaluation board can be easily
configured for a number of different applications. Table 2
provides the available settings for the jumpers and toggle switch
and explains their respective functions.
